Polyatomic Cations and Anions

ammonium: NH4+

hydronium: H3O+

hydroxide: OH^-

cyanide: CN-

peroxide: O2²-

carbonate: CO3²-

oxalate: C2O4²-

nitrite: NO2-

nitrate: NO3-

phosphite: PO3³-

phosphate: PO4³-

sulfite: SO3²-

sulfate: SO4²-

thiosulfate: S2O3²-

hypochlroite: CIO-

chlorite: CIO2^-

chlorate: CIO3^-

perchlorate: CIO4^-

acetate: CH3COO^- or C2H3O2^-

arsenate: AsO4³-

borate: BO3³-

silicate: SiO3²-

permanganate: MnO4^-

chromate: CrO4²-

…